DISTRIBUTION OF COINCIDENT IMPULSES OF NE URONS IN CATS MOTOR CORTEX IN THE COURSE OF LEARNING

Analysis of the dynamics of distribution of coincident impulses in pai rs of neurons revealed modifications in the structure of neuronal inte raction in the process of learning. In electrodefensive sound conditio ning coincident paired impulses of the neurons in cat's motor cortex w ere timed to the moment of the conditioned stimulus presentation. In f ood-procuring time conditioning coincident impulses were concentrated around the moment of the reinforcement administration. The described t emporal pattern of coincident impulse distribution is considered as a manifestation of a conditioned reaction at the level of neuronal inter action. This conclusion is confirmed by the finding that coincident im pulses may be grouped within the period of expected conditioned reacti on even in the absence of the defensive or food-procuring movement in well-trained cats.